Maghousing problem

[Dryballs]

Hi guys,

I've been building an engine for my Series 1 but have encountered a little problem!

I've used a Series 3 Li125 case with a new indian mag housing
Crank is a 60mm evergreen crank

When I tighten the mag housing on it jams against the crank!

I'm sure the crank is pulled all the way through.

It only grabs when I tighten the flange down, so it must be only fractions of a mm out.

Is this a common problem?

I was thinking a slightly thicker mag flange gasket would fix the problem, or maybe try to dress down the mag flange face with some sand paper on a mirror?

Any other thoughts on this?

Cheers,

Christiaan

[simon k]

Hi there Dryballs.have you checked the big end clearance on the casing?had a similar problem with this crank had to grind out a channel.
or is the oil seal retaining plate sitting proud?
Simon

[Dryballs]

Hi there Dryballs.have you checked the big end clearance on the casing?had a similar problem with this crank had to grind out a channel.
or is the oil seal retaining plate sitting proud?
Simon

Hi Simon,

I'll check it out... I also had the big end rub on a couple of places when I first put the crank in. I routed a channel in the casing for this with my die grinder

I might take the crank out and check the seal plate, but I would have thought it would catch on the crank rather than just push the crank out.

mmmm something more to ponder!

Chur,

db

[goldeneye]

check your oil seal retaining plate to see if it"s warped, aluminium ones are crap. have you lubed everything on assembly? somtimes a coating of clean two stroke makes everything ok. i never assemble an engine "dry". you could try two mag housing gaskets, but your better off trying to fettle the root cause of the problem. hope this helps. goldeneye.

[dsc scotty]

Check crank webs are fully pressed together, look at crank pin is it flush with webs? also crank may be out of true?

[Dryballs]

Thanks for your thoughts guys,

I might pull the crank out and check it over.

I'm not too keen on using 2 mag gaskets, its kinda like using 2 head gaskets! although I guess I could silicon them together?

I'll let you know what the crank looks like.

Cheers,


Christiaan

[Knowledge]

Two gaskets is not as big a crime as two head gaskets. It is an easy thing to try, without stripping the engine.